[GFS2] The core of GFS2
This patch contains all the core files for GFS2.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c
new file mode 100644
index 0000000..15cd26f
--- /dev/null
+++ b/fs/gfs2/recovery.c
@@ -0,0 +1,570 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <asm/semaphore.h>
+
+#include "gfs2.h"
+#include "bmap.h"
+#include "glock.h"
+#include "glops.h"
+#include "lm.h"
+#include "lops.h"
+#include "meta_io.h"
+#include "recovery.h"
+#include "super.h"
+
+int gfs2_replay_read_block(struct gfs2_jdesc *jd, unsigned int blk,
+ struct buffer_head **bh)
+{
+ struct gfs2_glock *gl = jd->jd_inode->i_gl;
+ int new = 0;
+ uint64_t dblock;
+ uint32_t extlen;
+ int error;
+
+ error = gfs2_block_map(jd->jd_inode, blk, &new, &dblock, &extlen);
+ if (error)
+ return error;
+ if (!dblock) {
+ gfs2_consist_inode(jd->jd_inode);
+ return -EIO;
+ }
+
+ gfs2_meta_ra(gl, dblock, extlen);
+ error = gfs2_meta_read(gl, dblock, DIO_START | DIO_WAIT, bh);
+
+ return error;
+}
+
+int gfs2_revoke_add(struct gfs2_sbd *sdp, uint64_t blkno, unsigned int where)
+{
+ struct list_head *head = &sdp->sd_revoke_list;
+ struct gfs2_revoke_replay *rr;
+ int found = 0;
+
+ list_for_each_entry(rr, head, rr_list) {
+ if (rr->rr_blkno == blkno) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (found) {
+ rr->rr_where = where;
+ return 0;
+ }
+
+ rr = kmalloc(sizeof(struct gfs2_revoke_replay), GFP_KERNEL);
+ if (!rr)
+ return -ENOMEM;
+
+ rr->rr_blkno = blkno;
+ rr->rr_where = where;
+ list_add(&rr->rr_list, head);
+
+ return 1;
+}
+
+int gfs2_revoke_check(struct gfs2_sbd *sdp, uint64_t blkno, unsigned int where)
+{
+ struct gfs2_revoke_replay *rr;
+ int wrap, a, b, revoke;
+ int found = 0;
+
+ list_for_each_entry(rr, &sdp->sd_revoke_list, rr_list) {
+ if (rr->rr_blkno == blkno) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found)
+ return 0;
+
+ wrap = (rr->rr_where < sdp->sd_replay_tail);
+ a = (sdp->sd_replay_tail < where);
+ b = (where < rr->rr_where);
+ revoke = (wrap) ? (a || b) : (a && b);
+
+ return revoke;
+}
+
+void gfs2_revoke_clean(struct gfs2_sbd *sdp)
+{
+ struct list_head *head = &sdp->sd_revoke_list;
+ struct gfs2_revoke_replay *rr;
+
+ while (!list_empty(head)) {
+ rr = list_entry(head->next, struct gfs2_revoke_replay, rr_list);
+ list_del(&rr->rr_list);
+ kfree(rr);
+ }
+}
+
+/**
+ * get_log_header - read the log header for a given segment
+ * @jd: the journal
+ * @blk: the block to look at
+ * @lh: the log header to return
+ *
+ * Read the log header for a given segement in a given journal. Do a few
+ * sanity checks on it.
+ *
+ * Returns: 0 on success,
+ * 1 if the header was invalid or incomplete,
+ * errno on error
+ */
+
+static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk,
+ struct gfs2_log_header *head)
+{
+ struct buffer_head *bh;
+ struct gfs2_log_header lh;
+ uint32_t hash;
+ int error;
+
+ error = gfs2_replay_read_block(jd, blk, &bh);
+ if (error)
+ return error;
+
+ memcpy(&lh, bh->b_data, sizeof(struct gfs2_log_header));
+ lh.lh_hash = 0;
+ hash = gfs2_disk_hash((char *)&lh, sizeof(struct gfs2_log_header));
+ gfs2_log_header_in(&lh, bh->b_data);
+
+ brelse(bh);
+
+ if (lh.lh_header.mh_magic != GFS2_MAGIC ||
+ lh.lh_header.mh_type != GFS2_METATYPE_LH ||
+ lh.lh_blkno != blk ||
+ lh.lh_hash != hash)
+ return 1;
+
+ *head = lh;
+
+ return 0;
+}
+
+/**
+ * find_good_lh - find a good log header
+ * @jd: the journal
+ * @blk: the segment to start searching from
+ * @lh: the log header to fill in
+ * @forward: if true search forward in the log, else search backward
+ *
+ * Call get_log_header() to get a log header for a segment, but if the
+ * segment is bad, either scan forward or backward until we find a good one.
+ *
+ * Returns: errno
+ */
+
+static int find_good_lh(struct gfs2_jdesc *jd, unsigned int *blk,
+ struct gfs2_log_header *head)
+{
+ unsigned int orig_blk = *blk;
+ int error;
+
+ for (;;) {
+ error = get_log_header(jd, *blk, head);
+ if (error <= 0)
+ return error;
+
+ if (++*blk == jd->jd_blocks)
+ *blk = 0;
+
+ if (*blk == orig_blk) {
+ gfs2_consist_inode(jd->jd_inode);
+ return -EIO;
+ }
+ }
+}
+
+/**
+ * jhead_scan - make sure we've found the head of the log
+ * @jd: the journal
+ * @head: this is filled in with the log descriptor of the head
+ *
+ * At this point, seg and lh should be either the head of the log or just
+ * before. Scan forward until we find the head.
+ *
+ * Returns: errno
+ */
+
+static int jhead_scan(struct gfs2_jdesc *jd, struct gfs2_log_header *head)
+{
+ unsigned int blk = head->lh_blkno;
+ struct gfs2_log_header lh;
+ int error;
+
+ for (;;) {
+ if (++blk == jd->jd_blocks)
+ blk = 0;
+
+ error = get_log_header(jd, blk, &lh);
+ if (error < 0)
+ return error;
+ if (error == 1)
+ continue;
+
+ if (lh.lh_sequence == head->lh_sequence) {
+ gfs2_consist_inode(jd->jd_inode);
+ return -EIO;
+ }
+ if (lh.lh_sequence < head->lh_sequence)
+ break;
+
+ *head = lh;
+ }
+
+ return 0;
+}
+
+/**
+ * gfs2_find_jhead - find the head of a log
+ * @jd: the journal
+ * @head: the log descriptor for the head of the log is returned here
+ *
+ * Do a binary search of a journal and find the valid log entry with the
+ * highest sequence number. (i.e. the log head)
+ *
+ * Returns: errno
+ */
+
+int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header *head)
+{
+ struct gfs2_log_header lh_1, lh_m;
+ uint32_t blk_1, blk_2, blk_m;
+ int error;
+
+ blk_1 = 0;
+ blk_2 = jd->jd_blocks - 1;
+
+ for (;;) {
+ blk_m = (blk_1 + blk_2) / 2;
+
+ error = find_good_lh(jd, &blk_1, &lh_1);
+ if (error)
+ return error;
+
+ error = find_good_lh(jd, &blk_m, &lh_m);
+ if (error)
+ return error;
+
+ if (blk_1 == blk_m || blk_m == blk_2)
+ break;
+
+ if (lh_1.lh_sequence <= lh_m.lh_sequence)
+ blk_1 = blk_m;
+ else
+ blk_2 = blk_m;
+ }
+
+ error = jhead_scan(jd, &lh_1);
+ if (error)
+ return error;
+
+ *head = lh_1;
+
+ return error;
+}
+
+/**
+ * foreach_descriptor - go through the active part of the log
+ * @jd: the journal
+ * @start: the first log header in the active region
+ * @end: the last log header (don't process the contents of this entry))
+ *
+ * Call a given function once for every log descriptor in the active
+ * portion of the log.
+ *
+ * Returns: errno
+ */
+
+static int foreach_descriptor(struct gfs2_jdesc *jd, unsigned int start,
+ unsigned int end, int pass)
+{
+ struct gfs2_sbd *sdp = jd->jd_inode->i_sbd;
+ struct buffer_head *bh;
+ struct gfs2_log_descriptor *ld;
+ int error = 0;
+ u32 length;
+ __be64 *ptr;
+ unsigned int offset = sizeof(struct gfs2_log_descriptor);
+ offset += (sizeof(__be64)-1);
+ offset &= ~(sizeof(__be64)-1);
+
+ while (start != end) {
+ error = gfs2_replay_read_block(jd, start, &bh);
+ if (error)
+ return error;
+ if (gfs2_meta_check(sdp, bh)) {
+ brelse(bh);
+ return -EIO;
+ }
+ ld = (struct gfs2_log_descriptor *)bh->b_data;
+ length = be32_to_cpu(ld->ld_length);
+
+ if (be16_to_cpu(ld->ld_header.mh_type) == GFS2_METATYPE_LH) {
+ struct gfs2_log_header lh;
+ error = get_log_header(jd, start, &lh);
+ if (!error) {
+ gfs2_replay_incr_blk(sdp, &start);
+ continue;
+ }
+ if (error == 1) {
+ gfs2_consist_inode(jd->jd_inode);
+ error = -EIO;
+ }
+ brelse(bh);
+ return error;
+ } else if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LD)) {
+ brelse(bh);
+ return -EIO;
+ }
+ ptr = (__be64 *)(bh->b_data + offset);
+ error = lops_scan_elements(jd, start, ld, ptr, pass);
+ if (error) {
+ brelse(bh);
+ return error;
+ }
+
+ while (length--)
+ gfs2_replay_incr_blk(sdp, &start);
+
+ brelse(bh);
+ }
+
+ return 0;
+}
+
+/**
+ * clean_journal - mark a dirty journal as being clean
+ * @sdp: the filesystem
+ * @jd: the journal
+ * @gl: the journal's glock
+ * @head: the head journal to start from
+ *
+ * Returns: errno
+ */
+
+static int clean_journal(struct gfs2_jdesc *jd, struct gfs2_log_header *head)
+{
+ struct gfs2_inode *ip = jd->jd_inode;
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ unsigned int lblock;
+ int new = 0;
+ uint64_t dblock;
+ struct gfs2_log_header *lh;
+ uint32_t hash;
+ struct buffer_head *bh;
+ int error;
+
+ lblock = head->lh_blkno;
+ gfs2_replay_incr_blk(sdp, &lblock);
+ error = gfs2_block_map(ip, lblock, &new, &dblock, NULL);
+ if (error)
+ return error;
+ if (!dblock) {
+ gfs2_consist_inode(ip);
+ return -EIO;
+ }
+
+ bh = sb_getblk(sdp->sd_vfs, dblock);
+ lock_buffer(bh);
+ memset(bh->b_data, 0, bh->b_size);
+ set_buffer_uptodate(bh);
+ clear_buffer_dirty(bh);
+ unlock_buffer(bh);
+
+ lh = (struct gfs2_log_header *)bh->b_data;
+ memset(lh, 0, sizeof(struct gfs2_log_header));
+ lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
+ lh->lh_header.mh_type = cpu_to_be16(GFS2_METATYPE_LH);
+ lh->lh_header.mh_format = cpu_to_be16(GFS2_FORMAT_LH);
+ lh->lh_sequence = cpu_to_be64(head->lh_sequence + 1);
+ lh->lh_flags = cpu_to_be32(GFS2_LOG_HEAD_UNMOUNT);
+ lh->lh_blkno = cpu_to_be32(lblock);
+ hash = gfs2_disk_hash((const char *)lh, sizeof(struct gfs2_log_header));
+ lh->lh_hash = cpu_to_be32(hash);
+
+ set_buffer_dirty(bh);
+ if (sync_dirty_buffer(bh))
+ gfs2_io_error_bh(sdp, bh);
+ brelse(bh);
+
+ return error;
+}
+
+/**
+ * gfs2_recover_journal - recovery a given journal
+ * @jd: the struct gfs2_jdesc describing the journal
+ * @wait: Don't return until the journal is clean (or an error is encountered)
+ *
+ * Acquire the journal's lock, check to see if the journal is clean, and
+ * do recovery if necessary.
+ *
+ * Returns: errno
+ */
+
+int gfs2_recover_journal(struct gfs2_jdesc *jd, int wait)
+{
+ struct gfs2_sbd *sdp = jd->jd_inode->i_sbd;
+ struct gfs2_log_header head;
+ struct gfs2_holder j_gh, ji_gh, t_gh;
+ unsigned long t;
+ int ro = 0;
+ unsigned int pass;
+ int error;
+
+ fs_info(sdp, "jid=%u: Trying to acquire journal lock...\n", jd->jd_jid);
+
+ /* Aquire the journal lock so we can do recovery */
+
+ error = gfs2_glock_nq_num(sdp,
+ jd->jd_jid, &gfs2_journal_glops,
+ LM_ST_EXCLUSIVE,
+ LM_FLAG_NOEXP |
+ ((wait) ? 0 : LM_FLAG_TRY) |
+ GL_NOCACHE, &j_gh);
+ switch (error) {
+ case 0:
+ break;
+
+ case GLR_TRYFAILED:
+ fs_info(sdp, "jid=%u: Busy\n", jd->jd_jid);
+ error = 0;
+
+ default:
+ goto fail;
+ };
+
+ error = gfs2_glock_nq_init(jd->jd_inode->i_gl, LM_ST_SHARED,
+ LM_FLAG_NOEXP, &ji_gh);
+ if (error)
+ goto fail_gunlock_j;
+
+ fs_info(sdp, "jid=%u: Looking at journal...\n", jd->jd_jid);
+
+ error = gfs2_jdesc_check(jd);
+ if (error)
+ goto fail_gunlock_ji;
+
+ error = gfs2_find_jhead(jd, &head);
+ if (error)
+ goto fail_gunlock_ji;
+
+ if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
+ fs_info(sdp, "jid=%u: Acquiring the transaction lock...\n",
+ jd->jd_jid);
+
+ t = jiffies;
+
+ /* Acquire a shared hold on the transaction lock */
+
+ error = gfs2_glock_nq_init(sdp->sd_trans_gl,
+ LM_ST_SHARED,
+ LM_FLAG_NOEXP |
+ LM_FLAG_PRIORITY |
+ GL_NEVER_RECURSE |
+ GL_NOCANCEL |
+ GL_NOCACHE,
+ &t_gh);
+ if (error)
+ goto fail_gunlock_ji;
+
+ if (test_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags)) {
+ if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
+ ro = 1;
+ } else {
+ if (sdp->sd_vfs->s_flags & MS_RDONLY)
+ ro = 1;
+ }
+
+ if (ro) {
+ fs_warn(sdp, "jid=%u: Can't replay: read-only FS\n",
+ jd->jd_jid);
+ error = -EROFS;
+ goto fail_gunlock_tr;
+ }
+
+ fs_info(sdp, "jid=%u: Replaying journal...\n", jd->jd_jid);
+
+ for (pass = 0; pass < 2; pass++) {
+ lops_before_scan(jd, &head, pass);
+ error = foreach_descriptor(jd, head.lh_tail,
+ head.lh_blkno, pass);
+ lops_after_scan(jd, error, pass);
+ if (error)
+ goto fail_gunlock_tr;
+ }
+
+ error = clean_journal(jd, &head);
+ if (error)
+ goto fail_gunlock_tr;
+
+ gfs2_glock_dq_uninit(&t_gh);
+
+ t = DIV_RU(jiffies - t, HZ);
+
+ fs_info(sdp, "jid=%u: Journal replayed in %lus\n",
+ jd->jd_jid, t);
+ }
+
+ gfs2_glock_dq_uninit(&ji_gh);
+
+ gfs2_lm_recovery_done(sdp, jd->jd_jid, LM_RD_SUCCESS);
+
+ gfs2_glock_dq_uninit(&j_gh);
+
+ fs_info(sdp, "jid=%u: Done\n", jd->jd_jid);
+
+ return 0;
+
+ fail_gunlock_tr:
+ gfs2_glock_dq_uninit(&t_gh);
+
+ fail_gunlock_ji:
+ gfs2_glock_dq_uninit(&ji_gh);
+
+ fail_gunlock_j:
+ gfs2_glock_dq_uninit(&j_gh);
+
+ fs_info(sdp, "jid=%u: %s\n", jd->jd_jid, (error) ? "Failed" : "Done");
+
+ fail:
+ gfs2_lm_recovery_done(sdp, jd->jd_jid, LM_RD_GAVEUP);
+
+ return error;
+}
+
+/**
+ * gfs2_check_journals - Recover any dirty journals
+ * @sdp: the filesystem
+ *
+ */
+
+void gfs2_check_journals(struct gfs2_sbd *sdp)
+{
+ struct gfs2_jdesc *jd;
+
+ for (;;) {
+ jd = gfs2_jdesc_find_dirty(sdp);
+ if (!jd)
+ break;
+
+ if (jd != sdp->sd_jdesc)
+ gfs2_recover_journal(jd, NO_WAIT);
+ }
+}
+